Question about JBL Car Audio & Video
As you said "the left rear speaker blew and became very hot". This is a symptom for problems at the amplifier stage (burn out internal amp parts, not protected by any fuse and giving DC output power at the speaker may cause this exact kind of problems at the speaker). I suggest a full check for the JBL amplifier at a service center. I don't suggest to use this amp at another speaker. This may destroy this speaker also. Depending on the exact kind of problem at the amplifier you may have to check the wiring between the amp and the burned speaker also, before you install the amp back to the original location.
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Posted on May 01, 2011
Hi you might need to do some troubleshooting... may not be from the amplifier,might be from the speakers too or any where...
Its the power transistors that would be affected by low voltage. It delivered till it finally gave up 'cos the output wattage to be generated at low voltage means more current flowing through the equipment. This high current will adversely affect all small solenoid valves & transistors and IC's. Even failure of one section of any IC is rarely detectable with the naked eye. It has to be thoroughly checked with a multi-meter to assess the damage correctly.
First check and sure you have battery voltage and twelve volt turn on on the remote term. of your amp. Be sure u have a ground also. Next take your speaker leads disconnect them and pop them with a battery, and make sure it pops. I(f that all passes you need to make sure your amp is getting an input signal because you could have a bad rca cable.
If the speaker only cuts out sporadically verify that the connections are all good. Cutting out is usually caused by a loose wire connection or an old connection that is corroded and shorting out.
If you cannot diagnose the problem on your own, you should take your vehicle to a professional.
Be careful working with vehicle electronics you can be shocked.
Check the Power
car batteryThe first thing you should check is the power. In my case, the red power light was coming on so the unit had to be getting juice from somewhere. I have a new battery and my vehicle always starts fine, so I didn't think it was a battery problem. If your car battery is getting old and especially if it seems sluggish in really cold weather, you may consider buying a new battery if your amp is having trouble.
A properly wired amplifier should include an in-line fuse on the cable that runs from the positive post on the battery to the amp's main power input. This is to prevent the amp from being overloaded or 'blown' and will save you a lot of trouble in the long run. I checked the fuse on my cable and found it to be intact although there was some black charred marks on the connectors.
Before you unhook any cables from your amplifier, make sure you disconnect that in-line fuse. Otherwise, you'll be holding a hot wire going straight to the battery and it can be dangerous, especially if it accidentally touches any other metal inside the vehicle. I know this from experience.
After checking the fuse and connections, my amp and subwoofer still didn't work, although the light showed that it was getting power.
Check the Ground
Improper grounding is one of the main causes for an amplifier not working properly. The most common place that people ground the amp is by running a wire to one of the bolts that holds down the front seat. That's how I have it wired in my truck. What's most important is for that wire to make good contact with the metal. Often times a lot of paint can interfere with the connection, and it is recommended that you wire brush away any paint to expose metal where the ground wire is connecting. I did this on mine, but in a way that was not at all conspicuous once I put everything back in place. Be careful not to scratch up the inside of your car.
Posted on Apr 30, 2011
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